Make poll interval configurable per source #2118

Job	Run time
Check unused dependencies	51s
Validate man pages	7s
Format	9s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 35s
Validate configs	32s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 29s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 25s
Audit dependencies	26s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-musl)	1m 29s
Clippy (x86_64-unknown-linux-gnu, false, true)	1m 3s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 51s
Clippy (armv7-unknown-linux-gnueabihf, true, false, -target arm-linux-gnueabihf -mcpu=generic+v7a...	41s
Smoke-test fuzzing targets	3m 52s
Build and test (stable, ubuntu-latest, --all-features, x86_64-unknown-linux-gnu)	1m 33s
Smoke-test fuzzing targets (--all-features)	3m 45s
Clippy (x86_64-unknown-linux-musl, true, false, -target x86_64-linux-musl)	48s
Build and test (msrv, ubuntu-latest, --all-features, x86_64-unknown-linux-gnu)	1m 31s
Clippy (x86_64-apple-darwin, true, false, -target x86_64-macos-gnu -g)	45s
Build and test (stable, ubuntu-latest, --all-features, x86_64-unknown-linux-musl)	1m 56s
Build and test (stable, macos-latest, --all-features, x86_64-apple-darwin)	1m 43s
	27m 31s

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